Magneto



H. G. COX.

MAGNETO. APPLICATION man JUNE 23, 1919.

Patented Nov. 14,1922.

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H. G. COX.

MAGNETO. APPLICATION FILED JUNE 23, 1919.

Patented Nov. 14, 1922.

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UNITED STATES PATENT OFFICE.

HENRY G. COX, OF CHICAGO, ILLINOIS, ASSIGNOR TO INTERNATIONAL HABVES'I'ER COMPANY, A CORPORATION OF NEW JERSEY.

MAGNETO.

Application filed June 23,

To all whom it may concern:

Be it known that I, HENRY G. Cox, a citizen of the United States, residing at Ch1-' cago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Magnetos, of which the following is a full, clear, and exact specification.

This invention relates to magnetos, and more particularly to the construction of armatures for magnetos.

As is well-known, the armature is the most expensive part of a magneto to manufacture, this being due to the fact that ordinarily the armature coil must be wound manually on the armature frame. This manual operation is necessarily time consuming and therefore the armature is an expensive part to make compared to the other parts of the magneto. The ordinary type of magneto armature is, moreover, more or less unsatisfactory, since the various parts of the armature are fitted together in such a way that if the necessity arises for their being taken apart, they cannot readil be assembled in such a manner that the a ignment of the parts is satisfactory, and for this reason a repaired armature is often defective.

The present invention, therefore, has for its object to provide an armature for magnetos and machines of like character that will be light in construction, but will also be rigid and stiff and able to withstand the stresses to which devices of this character are put.

A further object is to provide an armature that can be easily and quickly taken apart and can be accurately assembled without throwing the parts out of true alignment, thereby furnishing a construction that may be easily and effectively repaired.

Another object of the invention is to provide an improved construction of armature core by employing material of great magnetic conductivity, whereby the efliciency of the armature in operation is increased.

A still further object is to provide a construction of armature in which a formed winding may be utilized for the armature coil, this form of construction materially reducing the cost of the armature since the coil can be wound on an automatic machine instead of manually.

With these and other objects in view,

1919. Serial No. 306,084.

which will appear as the description proceeds, my invention consists briefly of an armature construction in which an armature frame is used, this frame preferably being cast and having open sides. A formed winding or a wound armature coil is placed within this armature frame and is retained therein by means of the armature core.

In order to make a complete disclosure of the invention, the improved construction has been illustrated in the accompaning drawings, and in these drawings Fig. 1 is a transverse sectional view through the magneto illustrating the im* proved construction of armature;

Fig. 2 is a sectional view taken at right angles to Fig. 1;

Fig. 3 is an end elevation of the magneto;

Fig. 4 is a perspective view showing the construction of armature frame;

Fig. 5 is a perspective view illustrating one embodiment of the armature pole shoe and core, this form of construction being shown in section in Fig. 1;

Fig. 6 is a, perspective view showing a modified construction of pole shoe;

Fig. 7 is a perspective view showing one construction of an armature core;

Fig. 8 is a transverse sectional view through the armature core and pole shoes illustrating one mounting of the core shown in Fig. 7;

Fig. 9 is a transverse sectional view similar to Fig. 8, but showing another mounting of the core and pole shoes; and

Fig. 10 is a sectional. elevation of the construction shown in Figs. 8 and 9.

In Figs. 1 and 2 I have illustrated a construction of magneto comprising a frame having a base 20, and a box-like frame structure 21 preferably formed integral with the base, the frame 21 and base 20 being formed of non-magnetic material, such, for instance, as zinc alloy. Permanent magnets 22 are secured in any suitable manner to the base 20 and frame 21, and pole pieces 23 are carried by the frame 21 in a manner to retain them in contact with the poles of the permanent magnets 22. Suitable end plates 24 and 25 are secured to the. ends of the frame 21 and are formed with bearings 26 in which the armature is rotatablv mounted. No invention per se is claimed for the construction just described and any other suitable form of magneto frame may be employed.

The armature comprises an armature frame :27 formed of nonmagnetic material, such as aluminum, this frame being preferably dieast and having cast therewith outwardly projecting stub shafts 28 and 29. The frame 2. has formed at its ends annular lips 30 which act in a well-known manner to fling the oil'which is used in lubricating the parts outwardly, thereby preventii'ig any of the oil. from co ning in contact with the insulated winding of the armature. An oil exit opening "fl is formed in eachot the end plates to pen the discharge of!" the oil. As stated above. a termed winding or wound coil is used in connection with my armature and this coil is indicated 32 and may consist of a single winding or oi a primary and secondary winding if the armature is to be used for l'iigh te sion mugnetos.

drawings have illustrated the constru tron for e low lJKEDSlOXimZlf IGtO consiwting of a single coil. The oil 32 is placed within the open rectangular armature frame 27 and is retained therein in the following manner. Referring to F l, I have illustrated one construction of retaining; means, this construction comprising core pieces formed with inwardly exteudn, portions 3- and pole shoes 35.

(3 Eli-1s core construction may be formed of low carbon steel, or oil cast iron and the core pieces secured in piece by means transverse rivets which extend through the core and pole shoes and are headed over in a manner to securely retain'the core pieces and the coii 32 in place on the armature frame 27. As illustratedin Fig. l, I have devised means for properly positioning the pole shoes, this means comprising outwardly extending dowel pins which cooperate with dowel holes 38 formed in the pole shoes.

t has been found that although ther iorm of core construction shown in Fig. l and net described gives satisfa on. a construction of armaturecore in which a soiter grade of iron can he used is still more satisfactory, since this grade of iron possesses greater magnetic conductivity. and therefore cores made or this grade of iron will reverse their polarity much more easily. has been worked out, therefore. utilizing this softer gredeoif iron, such as llorwayiron, and this construction is iilustrated in Figs. 7. 8,9 and 10. The construction illustrated also makes use of the fact that a plura-lityof comparatively small parallel coiiductorsis than single larger conductor, since the smell conductors, when held in close contact" with each other. have lessv residual magnetism, are not as subject to local currents and eddy currents, and forthese reasons rex erse their polarity muchinore easily. As;

above stated, the conductors in this instance ere formed'of a- Very soft grade of Norway 1ron,a plurality of these small. conductors A construction Fig. 8) I have shown pole shoes 4:1 positioned in contact with the outer ends of the conductors 39, the pole shoes being securely held in contact with the core by means of transverse rivets 12 similar to the rivets 38 sl-iown in Fig. 1.

Another method oi securing the core in place is illustrated in Fig. where the pole shoes 43 are shown asrecessed, the core be ii longer than that shown in Fig. 8 and tending into the recesses of the pole pieces. ii hiitable rivets 44.- are used in the other formsto retain the pole and core on tl armature frame flhe'l'orin of construction shown in 9 has the adyantage ii usinga greater amount of iron core, 'cby increasing the magnetic conduo rity of the armature. I v in Fig. 2 l have illustrated one method of conducting the current from the armature 'coil, leadwire .5 being; secured to the coil preferably formed of brass, and mounted in bushing; 50 formed of non-conducting inaierial and carried by thehellow' shaft 29.

The shaft 29 is provided with an inwardly extending rib 51, and the plug 4:9 is secured against endwise and rotetiye movement by means of a nut 52 spaced from the rib 51 by u washer '53 which "formed of insulating material and is dismised Onone side of and contacts with one side oi qthe rib 51,. Another insulating; washer is interposed between the other surface of rib and the plug 49. Any other means for conducting the current from the armature coil may be employed. if desired, the particular form illustrated and described being shown merely "for the purpose of disclosing one method for accomplishing this end.

Having described the construction of my improved armature, I will now set forth brieliythe method of assembling the arma- 34 of the corepieces 33 are passed within the opening of the coil from the opposite sides thereof, and the rivets 36 are then passed through thecore pleces and are head- }ed over, securelyretaining the various parts together. If the form of core illustrated in Figs. 8 and 9 is utilized, the core package is passed through the openin in the coil, and then the pole shoes are p aced in position and the rivets are passed through the shoes and core. If, for any reason, it is desired to take the armature apart, it is merely necessary to file off or otherwise remove the heads of the rivets, whereupon the pole shoes or core pieces may be withdrawn from the coil, permitting the removal of the coil from the armature frame.

Ihe advantages of the improved construction have already been full set forth in this specification, and a furt er statement is therefore believed to be unnecessary.

While certain embodiments of the invention have been illustrated in the acc0mpany of the invention, as expressed in the following claims.

I claim:

1. In an armature,an integral frame having open sides, a coil disposed within the frame, and means comprising pole pieces for removably securing the coil in the frame and closing the sides thereof.

2. In an armature, an integral framehaving open sides, a coil disposed within the frame, a core disposed within the coil and means comprising pole pieces for removably securing the coil in the frame and closing the sides thereof.

3. In an armature, an integralframe having open sides, a coil disposed within said frame and havmg an opening therethrough, a core disposed in the opening of said coil and comprising a plurality of parallel magnetic conductors, and means for retaining said core and said coil within said frame.

4. In an armature, an inte al frame formed of non-magnetic materia and having open sides, a coil disposed within said frame and having an opening therethrough,

within said frame, a core disposed within.

said coil, pole shoes havin recessed portions receiving said core, an means passing through said pole shoes and said core for retaining said. core in said coil and said coil in said frame.

7. In an armature, a frame, a coil disposed within said frame, a core disposed within said coil, pole shoes contacting with the ends of said core, and means passing through said pole shoes and said core for retaining said core and said coil in said frame.

8. In an armature, a frame, a coil disposed within said frame, a core disposed within said coil comprising a plurality of tightly bound parallel ma netic conductors, pole shoes having recesse portions receiving said core, and means passing through said pole shoes and said core for retaining said core in said coil and said coil in said frame. 7

In testimony whereof I aflix my signature.

HENRY G. COX. 

